To disturb the vortex caused by peeling the flow of wind by the front edge part of the bridge beam to clamp the vibration of a bridge beam and improve the wind resisting stability by setting a plate-like member in parallel, to the bridge beam with a prescribed distance from the bridge beam in the upper part and/or lower part of the bridge beam near the axially right- angled directional center of the bridge beam.
A plate-like member 2 is provided in parallel to a bridge beam 1 with a prescribed distance from the bridge beam 11 in the upper part near the axially right-angled directional center of the bridge beam 1. The member 2 is fixed at a proper interval continuously over the whole axial directional span of the bridge beam 11 by use of poles provided vertically to the bridge beam 11. A vortex 3 peeled by the front edge part 1a of the bridge beam 11 is collided with the member 2 and disturbed to form a small vortex 7. Thus, the generated negative pressure is minimized, the vibration of the bridge beam 1 is effectively suppressed to improve the wind resisting stability, and an industrially efficient effect can be provided.
TSUMURA NAOYOSHI
TAKEDA KATSUAKI
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